Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3c20d974c954a0a152ac95cab55d7a59b7bd15e5dd6fb91fbe0b0a327ce17748:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^